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母親在美申請綠卡，第一次指紋末過，正在等候第二次打指紋。是不是AP一定要等指紋通過才能開始處理？

-No. But your monthe had better not leave US until the fingerprinting is done. If she fails in the fingerprinting again, USCIS may ask her to provide the police clearance certificate (i.e. non-criminal record certificate) from both China and US.

如果第二次指紋還不過呢？指紋較淺，以前在海關也是采集指紋很困難。有沒有辦法在打指紋當時就知道指紋是否通過？要不又要等一個月才知道過不了。太耽誤時間了。